LEWISTON – Next month’s Steelhead Expo and Derby to be held at the Hells Canyon Grand Hotel in Lewiston has roots that span from the Lewiston-Clarkston Valley to Cabo San Lucas, Mexico.

Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon.

About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million years ago, new research estimates.

Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon. Matthew Morriss ...